To become a mediator, you must attend a mediation training course.

The following organisations offer CMC Registered training courses which can lead to CMC Registered status (see here [link] for all of the registration requirements).

Academy of Experts
ADR-ODR International
ADR Group
Align Mediation (though not the distance learning course)
BIMA
CEDR
Clear ADR
Globis Mediation Group
Hunt ADR
London School of Mediation
National Dispute Resolution
Phoenix Dispute Solutions
ProMediate
Regents University London
Royal Institute of Chartered Surveyors (RICS)
SCMA Ltd
Society of Mediators
University of Central Lancashire